Automating with GitLab Duo, Part 3: Validating testing

In the final installment of the series on GitLab Duo, the team conducted a validation test to measure the impact of using GitLab Duo for automated testing. By initially setting their test coverage to 0%, they replaced and increased test coverage using GitLab Duo-generated tests, maintaining a stable control group by avoiding human modifications. Throughout the process, the team engaged with GitLab Duo to update tests based on errors or failures, reaching an impressive 84% test coverage within two days by a single engineer, a significant improvement from the previous 74% achieved over four weeks by multiple engineers. The experiment demonstrated that GitLab Duo enhanced testing efficiency, enabling developers with less context to quickly write valuable tests, and increased the team's confidence in developing new features without introducing errors. As a result, test coverage has further increased to 89% while new features continue to be introduced, highlighting GitLab Duo's role in improving testing processes.

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